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Microstructure and morphology evolution of high-Z/low-Z gradient coatings on PAMS microspheres
Materials Letters ( IF 3.204 ) Pub Date : 2020-01-21 , DOI: 10.1016/j.matlet.2020.127380
Chao Huang; Yansong Liu; Lei Liu; Yajun Fu; Zhibing He; Kai Du; Linhong Cao

Gradient coatings exhibit excellent implosion performance in double-shell targets for Inertial Confinement Fusion (ICF). Here, we present the controllable preparation of high-Z/low-Z (Z is the atomic number) gradient alloy coatings which can be used for ICF double-shell targets. Tungsten/carbon (W/C), tungsten/silicon (W/Si) and tungsten/aluminum (W/Al) gradient coatings were successfully deposited on silicon substrates and poly-alpha-methyl-styrene (PAMS) spheres by direct-current magnetron sputtering. The morphology, component and surface roughness of gradient coatings were characterized. Although there are significant differences in morphology and surface roughness compared with planar gradient coatings, the spherical gradient coatings still have a dense microstructure and smooth surface. The root-mean-square (RMS) roughness of our gradient coatings experience an improvement compared with the previous films which used in ICF experiments. The gradient coatings deposited by co-sputtering of high-Z and low-Z elements in this work provide competitive candidate materials for ICF double-shell targets.

更新日期:2020-01-21

 

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